1. Department of General Surgery, Yangpu Hospital, School of Medicine, Tongji University, Shanghai, P. R. China
2. School of Medicine, Shanghai University, Shanghai, P. R. China
3. Center for Clinical Research and Translational Medicine, Yangpu Hospital, School of Medicine, Tongji University, Shanghai, P. R. China
4. Department of Hepatic Surgery, Eastern Hepatobiliary Surgery Hospital, Navy Military Medical University, Shanghai, P. R. China